jQuery.extend({
	createUploadIframe : function(id, uri) {
		// create frame
		var frameId = 'jUploadFrame' + id;

		if (window.ActiveXObject) {
			// var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
			// if(typeof uri== 'boolean'){
			// io.src = 'javascript:false';
			// }
			// else if(typeof uri== 'string'){
			// io.src = uri;
			// }

			// fix ie9 and ie 10-------------
			if (jQuery.browser.version == "9.0" || jQuery.browser.version == "10.0") {
				var io = document.createElement('iframe');
				io.id = frameId;
				io.name = frameId;
			} else if (jQuery.browser.version == "6.0" || jQuery.browser.version == "7.0" || jQuery.browser.version == "8.0") {
				var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
				if (typeof uri == 'boolean') {
					io.src = 'javascript:false';
				} else if (typeof uri == 'string') {
					io.src = uri;
				}
			}
		} else {
			var io = document.createElement('iframe');
			io.id = frameId;
			io.name = frameId;
		}
		io.style.position = 'absolute';
		io.style.top = '-1000px';
		io.style.left = '-1000px';

		document.body.appendChild(io);

		return io
	},
	createUploadForm : function(id, fileElementId, tag_name, tag_link, tag_sort, tag_status, tag_id, data) {
		// create form
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		// --
		var tagNameId = 'tag_name' + id;
		var tagLinkId = 'tag_link' + id;
		var tagSortId = 'tag_sort' + id;
		var tagStatusId = 'tag_status' + id;
		var tagIdId = 'tag_id' + id;
		// --end
		var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
		var oldElement = $('#' + fileElementId);
		var newElement = $(oldElement).clone();
		// --
		var tagNameElement = '<input type="text" name="tag_name" value="' + tag_name + '">';
		var tagLinkElement = '<input type="text" name="tag_link" value="' + tag_link + '">';
		var tagSortElement = '<input type="text" name="tag_sort" value="' + tag_sort + '">';
		var tagStatusElement = '<input type="text" name="tag_status" value="' + tag_status + '">';
		var tagIdElement = '<input type="text" name="tag_id" value="' + tag_id + '">';
		// --end
		$(oldElement).attr('id', fileId);
		$(oldElement).before(newElement);
		$(oldElement).appendTo(form);
		// --
		$(tagNameElement).appendTo(form);
		$(tagLinkElement).appendTo(form);
		$(tagSortElement).appendTo(form);
		$(tagStatusElement).appendTo(form);
		$(tagIdElement).appendTo(form);
		// --end

		// 增加文本参数的支持
		if (data) {
			for ( var i in data) {
				$('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
			}
		}

		// set attributes
		$(form).css('position', 'absolute');
		$(form).css('top', '-1200px');
		$(form).css('left', '-1200px');
		$(form).appendTo('body');
		return form;
	},

	ajaxFileUpload : function(s) {
		// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
		s = jQuery.extend({}, jQuery.ajaxSettings, s);
		var id = new Date().getTime()
		var form = jQuery.createUploadForm(id, s.fileElementId, s.tag_name, s.tag_link, s.tag_sort, s.tag_status, s.tag_id, s.data);
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;
		// Watch for a new set of requests
		if (s.global && !jQuery.active++) {
			jQuery.event.trigger("ajaxStart");
		}
		var requestDone = false;
		// Create the request object
		var xml = {}
		if (s.global)
			jQuery.event.trigger("ajaxSend", [ xml, s ]);
		// Wait for a response to come back
		var uploadCallback = function(isTimeout) {
			var io = document.getElementById(frameId);
			try {
				if (io.contentWindow) {
					xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
					xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;

				} else if (io.contentDocument) {
					xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
					xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
				}
			} catch (e) {
				jQuery.handleError(s, xml, null, e);
			}
			if (xml || isTimeout == "timeout") {
				requestDone = true;
				var status;
				try {
					status = isTimeout != "timeout" ? "success" : "error";
					// Make sure that the request was successful or notmodified
					if (status != "error") {
						// process the data (runs the xml through httpData regardless of callback)
						var data = jQuery.uploadHttpData(xml, s.dataType);
						// If a local callback was specified, fire it and pass it the data
						if (s.success)
							s.success(data, status);

						// Fire the global callback
						if (s.global)
							jQuery.event.trigger("ajaxSuccess", [ xml, s ]);
					} else
						jQuery.handleError(s, xml, status);
				} catch (e) {
					status = "error";
					jQuery.handleError(s, xml, status, e);
				}

				// The request was completed
				if (s.global)
					jQuery.event.trigger("ajaxComplete", [ xml, s ]);

				// Handle the global AJAX counter
				if (s.global && !--jQuery.active)
					jQuery.event.trigger("ajaxStop");

				// Process result
				if (s.complete)
					s.complete(xml, status);

				jQuery(io).unbind()

				setTimeout(function() {
					try {
						$(io).remove();
						$(form).remove();

					} catch (e) {
						jQuery.handleError(s, xml, null, e);
					}

				}, 100)

				xml = null

			}
		}
		// Timeout checker
		if (s.timeout > 0) {
			setTimeout(function() {
				// Check to see if the request is still happening
				if (!requestDone)
					uploadCallback("timeout");
			}, s.timeout);
		}
		try {
			// var io = $('#' + frameId);
			var form = $('#' + formId);
			$(form).attr('action', s.url);
			$(form).attr('method', 'POST');
			$(form).attr('target', frameId);
			if (form.encoding) {
				form.encoding = 'multipart/form-data';
			} else {
				form.enctype = 'multipart/form-data';
			}
			$(form).submit();
		} catch (e) {
			jQuery.handleError(s, xml, null, e);
		}
		if (window.attachEvent) {
			document.getElementById(frameId).attachEvent('onload', uploadCallback);
		} else {
			document.getElementById(frameId).addEventListener('load', uploadCallback, false);
		}
		return {
			abort : function() {
			}
		};

	},

	uploadHttpData : function(r, type) {
		var data = !type;
		data = type == "xml" || data ? r.responseXML : r.responseText;
		// If the type is "script", eval it in global context
		if (type == "script")
			jQuery.globalEval(data);
		// Get the JavaScript object, if JSON is used.
		if (type == "json") {
			// 去掉<pre></pre>标签
			// //////////以下为新增代码///////////////
			data = r.responseText;
			var start = data.indexOf(">");
			if (start != -1) {
				var end = data.indexOf("<", start + 1);
				if (end != -1) {
					data = data.substring(start + 1, end);
				}
			}
			// /////////以上为新增代码///////////////
			eval("data = " + data);
		}
		// evaluate scripts within html
		if (type == "html")
			jQuery("<div>").html(data).evalScripts();
		// alert($('param', data).each(function(){alert($(this).attr('value'));}));
		return data;
	},

	handleError : function(s, xhr, status, e) {
		// If a local callback was specified, fire it
		if (s.error) {
			s.error.call(s.context || window, xhr, status, e);
		}
		// Fire the global callback
		if (s.global) {
			(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [ xhr, s, e ]);
		}
	}
})